docs: def package_installed(self,
  	                      package,
  	                      shutit_pexpect_child=None,
  	                      note=None,
  	                      loglevel=logging.DEBUG):
  		"""Returns True if we can be sure the package is installed.
  
  		@param package:   Package as a string, eg 'wget'.
  		@param shutit_pexpect_child:     See send()
  		@param note:      See send()
  
  		@rtype:           boolean
  		"""
  		shutit_pexpect_child = shutit_pexpect_child or self.get_current_shutit_pexpect_session().pexpect_child
  		shutit_pexpect_session = self.get_shutit_pexpect_session_from_child(shutit_pexpect_child)
  		return shutit_pexpect_session(package,note=note,loglevel=loglevel)